US3678472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data storage arrangements
Assignee: Plessey Overseas Ltd
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Filing: 1970-05-13
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Granted: 1972-07-18
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Expires: 1990-05-13
Abstract
Abstract A data storage arrangement in which information is stored in the form of a plurality of juxtaposed holograms in which a pulsed light beam is caused to successively traverse the holograms, it being arranged that the light beam pulsates at a frequency corresponding to the time period taken to make one traverse of the holograms, the relative position of the light beam pulse during said period being variable so that the light beam illuminates a certain one of said holograms for the purpose of reading out information stored therein.
Inventors
- 👤 John C Bass
- 👤 Peter Waterworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:01
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/042; G11C13/046; H; H04; H04N; H04N5/00; H04N5/76; H04N5/89; H04N5/90
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
103 words
A data storage arrangement comprising storage means in which information is stored in the form of a plurality of juxtaposed holograms, a laser light source for affording a pulsed light beam, and means for causing said pulsed light beam to successively traverse the holograms of the storage means, the light beam being arranged to pulsate once every complete traverse of said holograms the duration of the light beam pulse being such that one or more of said holOgrams is illuminated each traverse for read-out purposes, and read-out means for detecting an interference pattern resulting from the illumination of said one or more holograms.
Claim 2
Dependent Claim
103 words
A data storage arrangement comprising storage means in which information is stored in the form of a plurality of juxtaposed holograms, a laser light source for affording a pulsed light beam, and means for causing said pulsed light beam to successively traverse the holograms of the storage means, the light beam being arranged to pulsate once every complete traverse of said holograms the duration of the light beam pulse being such that one or more of said holOgrams is illuminated each traverse for read-out purposes, and read-out means for detecting an interference pattern resulting from the illumination of said one or more holograms.
Claim 3
Dependent Claim
39 words
A data storage arrangement as claimed in claim 1, in which the relative position of the light beam pulse during each complete traverse of the holograms is variable for causing a selected one of said holograms to be illuminated.
Claim 4
Dependent Claim
22 words
A data storage arrangement as claimed in claim 1, in which the laser is Q-switched to cause the light beam to pulsate.
Claim 5
Dependent Claim
24 words
A data storage arrangement as claimed in claim 1, in which the light beam from the laser is modulated to cause it to pulsate.
Claim 6
Dependent Claim
96 words
A data storage arrangement as claimed in claim 4, comprising modulating means to which the laser light beam is fed, the modulating means including polarizing means for polarizing the laser light beam, electro-optic switch means and an analyzer element which is sensitive to the plane of polarization of the light beam, the electro-optic switch means being effective for causing the plane of polarization of the polarized light beam to be rotated so that it is passed or blocked by said analyzer element dependent upon the plane of polarization of the light beam from said switch means.
Claim 7
Dependent Claim
37 words
A data storage arrangement as claimed in claim 1, in which the laser light beam is caused to traverse the plurality of holograms by arranging that the holograms are moved and the light beam is maintained stationary.
Claim 8
Dependent Claim
37 words
A data storage arrangement as claimed in claim 1, in which the laser light beam is caused to traverse the holograms by arranging that the light beam is deflected, the laser and the holograms being maintained stationary.
Claim 9
Dependent Claim
36 words
A data storage arrangement as claimed in claim 1, in which the plurality of holograms are arranged circumferentially on a rotatable plate, said holograms being individually illuminated by means of a stationary modulated laser light beam.
Claim 10
Dependent Claim
82 words
A data storage arrangement as claimed in claim 8, in which in order to achieve synchronsim between the rotation of the rotatable plate and the modulation of the light beam, there is generated a reference pulse corresponding to a predetermined position of said plate, the reference pulse being used to cause the laser light beam to be modulated, there being provided delay means for delaying said reference pulse for the purpose of causing a particular one of said holograms to be illuminated.
Claim 11
Dependent Claim
34 words
A data storage arrangement as claimed in claim 1, comprising read-out means for reading out information stored in the illuminated hologram, the read-out means comprising photo-sensitive means onto which the illuminated hologram is focused.
Claim 12
Dependent Claim
30 words
A data storage arrangement as claimed in claim 10, in which the photo-sensitive means is scanned to afford an electronic signal corresponding to the information stored in the illuminated hologram.
Claim 13
Dependent Claim
21 words
A data storage arrangement as claimed in claim 10, in which the photo-sensitive means takes the form of a photo-diode array.
References Cited (Backward Citations)
US3229047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |